【摘要】 输电塔线体系由于具有大跨、高柔的特性,在风荷载的作用下容易产生较大的振动,对风荷载的作用比较敏感,因此风荷载是输电塔线体系极其重要的设计荷载,起着决定性作用。文章基于脉动风的基本特性和Davenport风速谱,提出了时域法中基于按时间抽取的快速傅里叶变换技术改进的谐波合成法,然后对输电塔线体系的脉动风场进行了仿真,结果表明,仿真的脉动风速与实际风速一致,仿真的风场符合脉动风的空间相关性规律,计算效率得到了提高。更多还原

【Abstract】 Due to its features of large cross span,high height and flexibility,transmission tower-line system is sensitive to wind load and easy to occur visible vibration under wind load. For this reason,wind load is a very important design load playing a decisive role for such a structure as transmission tower-line systems and so on. Based on the basic features of fluctuating wind and Davenport wind speed spectrum,in this paper a method to simulate the fluctuating wind field of transmission tower-line system by weighted amplitude wave superposition (WAWS) method which is improved by decimation-in-time fast Fourier transform (DIT-FFT) in time domain is proposed. Using the proposed method,the simulation of an actual example of transmission tower-line system is performed,and the results show that the simulated fluctuating wind speed is in conformity to true wind speed as well as the simulated wind field conforms to spatial correlation rule of fluctuating wind. Besides,calculation efficiency is improved obviously.更多还原